Jazz has long been music reserved for the best players and has produced some of popular music's most memorable eccentrics and rebels. While not a jazz show in the purest sense, Jazz at the Root (taking place this Thursday, April 29, at the Meadowlark with a wealth of talent on the bill) lives up to its title. Former Czars guitar hero Roger Green's solo material and performance experiments draw clear inspiration from jazz rule-breakers like Ornette Coleman. Lelah Simon, meanwhile, may be better known for her stints in Astrophagus and Ode to the Marionette, but her facility as a jazz bassist informs all of her work. Likewise, Cloud City may have come together originally to do a hip-hop remix of a folk song, but its original material shows how jazz can be purely electronic without being dumbed down, and SuperCollider includes veterans of the local and national jazz and improv scenes.